scholarly journals Fractionation and characterization of lignin from sugarcane bagasse using a sulfuric acid catalyzed solvothermal process

RSC Advances ◽  
2021 ◽  
Vol 11 (43) ◽  
pp. 26773-26784
Author(s):  
Saksit Imman ◽  
Punjarat Khongchamnan ◽  
Wanwitoo Wanmolee ◽  
Navadol Laosiripojana ◽  
Torpong Kreetachat ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sugarcane Bagasse ◽  
Solvothermal Process ◽  
Global Sustainability ◽  
Lignocellulosic Residue ◽  
Acid Catalyzed

Conversion of lignocellulosic residue to bioenergy and biofuel is a promising platform for global sustainability.

scholarly journals Fractionation and characterization of lignin from sugarcane bagasse using a sulfuric acid catalyzed solvothermal process

2020 ◽  
Author(s):  
Saksit Imman ◽  
Punjarat Khongchamnan ◽  
Wanwitoo Wanmolee ◽  
Navadol Laosiripojana ◽  
Torpong Kreetachat ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Sugarcane Bagasse ◽  
Organic Phase ◽  
Solid Phase ◽  
Value Added ◽  
Solvothermal Process ◽  
Organosolv Lignin ◽  
Lignin Recovery ◽  
Cross Links ◽  
Acid Catalyzed

Abstract Background: Conversion of lignocellulosic residue to bioenergy and biofuel is a promising platform for global sustainability. Fractionation is an initial step for isolating lignocellulosic components for subsequent valorization. The aim of this research is to develop the solvothermal fractionation of sugarcane bagasse to produce high purity lignin. Physio-chemical structure of isolated lignin from this process was determined.Results: In this study, a central composite design-based response surface methodology (RSM) was used to optimize an acid promoter for isolating lignin from sugarcane bagasse using a solvothermal fractionation process. The reaction was carried out with sulfuric acid, in the concentration of 0.01-0.02 M and a reaction temperature of 180-200°C for 30-90 min. The optimal conditions for the experiment were obtained at the acid concentration of 0.02 M with a temperature of 180ºC for 90 min in methyl isobutyl ketone (MIBK)/methanol/water (35%:25%:40% v/v%). The results showed that 87.1% of lignin recovery was conducted in the organic phase, while 88.0% of lignin removal was done in the solid phase. Furthermore, the change in the physico-chemical characteristics of solid residue and lignin recovery was recorded using various techniques. A GPC analysis of recovered lignin from the organic fraction showed a low average Mw/Mn (1374/785 g/mol) and lower polydispersity index (1.75) compared to commercial organosolv lignin. The maximum lignin degradation temperatures of recovered lignin and commercial organosolv lignin were estimated to be 310°C and 334°C, which can point to potential relationships with the degradation of β-O-4 cross-links. The results indicated that recovered lignin is mostly cross-linked by the β-O-4 cross-links.Conclusions: The development of sulfuric acid catalyzed solvothermal process in this study provides the efficient extraction of high-value organosolv lignin from sugarcane bagasse and the production of recovered lignin in organic phase with low contamination from other contents. The lignin characteristic data can contribute to the development of lignin valorization in value-added applications.

scholarly journals Hydrothermal Pretreatment of Wheat Straw: Effects of Temperature and Acidity on Byproduct Formation and Inhibition of Enzymatic Hydrolysis and Ethanolic Fermentation

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 487
Author(s):  
Dimitrios Ilanidis ◽  
Stefan Stagge ◽  
Leif J. Jönsson ◽  
Carlos Martín
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Wheat Straw ◽  
High Performance ◽  
Enzymatic Saccharification ◽  
Hydrothermal Pretreatment ◽  
Gas Chromatography Mass Spectrometry ◽  
Enzymatic Digestibility ◽  
Acid Catalyzed ◽  
Pretreatment Conditions

Biochemical conversion of wheat straw was investigated using hydrothermal pretreatment, enzymatic saccharification, and microbial fermentation. Pretreatment conditions that were compared included autocatalyzed hydrothermal pretreatment at 160, 175, 190, and 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment at 160 and 190 °C. The effects of using different pretreatment conditions were investigated with regard to (i) chemical composition and enzymatic digestibility of pretreated solids, (ii) carbohydrate composition of pretreatment liquids, (iii) inhibitory byproducts in pretreatment liquids, (iv) furfural in condensates, and (v) fermentability using yeast. The methods used included two-step analytical acid hydrolysis combined with high-performance anion-exchange chromatography (HPAEC), HPLC, ultra-high performance liquid chromatography-electrospray ionization-triple quadrupole-mass spectrometry (UHPLC-ESI-QqQ-MS), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Lignin recoveries in the range of 108–119% for autocatalyzed hydrothermal pretreatment at 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment were attributed to pseudolignin formation. Xylose concentration in the pretreatment liquid increased with temperature up to 190 °C and then decreased. Enzymatic digestibility was correlated with the removal of hemicelluloses, which was almost quantitative for the autocatalyzed hydrothermal pretreatment at 205 °C. Except for the pretreatment liquid from the autocatalyzed hydrothermal pretreatment at 205 °C, the inhibitory effects on Saccharomyces cerevisiae yeast were low. The highest combined yield of glucose and xylose was achieved for autocatalyzed hydrothermal pretreatment at 190 °C and the subsequent enzymatic saccharification that resulted in approximately 480 kg/ton (dry weight) raw wheat straw.

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